Rotary blower.



G. G. HICKS, JR. & R. G. ENYART. ROTARY BLOWER.

Patented June 2, 1914.

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GEORGE C. HICKS, JR., AND RALPH C. ENYAR'I, OF CUNNEBEVILLE, INDIANA,ASSIGN- ORS TO THE 1?. H. 6t 13. 1V5. RUOTS COMPANY, 0F CONNERS'VILLE,INDIANA.

ROTARY BLOVVEH.

inseam.

To all whom it may concern:

Be it known that we, Gnonon G. lrlions, Jr., and RALPH C. ENYART,citizens of the United States, and residents of Connorsville, Fayettecounty, Indiana, have invented certain new and useful Improvements inRotary Blowers, of which the following is a specification.

1n rotary blowers working under comparatively high pressure, the heatdue to compression has been found in some cases to lead to undesirableresults. To overcome this, provision has heretofore been made forcirculating cooling water through the lobes of the impellers, but theconstruction, while accomplishing the desired results, has not beenaltogether satisfactory.

Our present invention relates to improved means for effecting thecirculation of cooling water through the impellers and the improvementswill be readily understood from the following description taken inconnection with the accompanying drawings in which Figure 1 is adiametrical section, in the plane of line a of Figs. 2 and 3, of animpeller fitted with our improved water-circulating means: Fig. 2 an endelevation of the same: Fig. 8 a vertical transverse section of a portionof the impeller, in the plane of line b of Fig. 1: and Fig. t a verticalsection of the water inlet connection in the plane of line a of Figs. 2and 3.

In the drawings :1, indicates an impeller of a rotary blower,illustrated as of the well known Roots type, the impeller being a hollowcasting; 2, the chamber in one of the lobes of the impeller: 3, thechamber in the other lobe of the impeller: 4-, the shaft on which theimpeller is firmly secured ,in the usual manner: 5, partitions arrangedtransversely in the chambers of the lobes to give strength to theimpeller, these partitions having openings through them so that, whileeach partition divides the chamber of a lobe into two compartments, thetwo compart ments are in free communication with each other: 6, therecess usually provided in the hubs of impellers to avoid the necessityfor making a fit between the hub and the shaft except at each end of theimpeller: 7, apertures leading from this recess to the chambers of theimpellers, preferably at those compartments of the chambers which arefarthest from the end of the impeller at specification of LettersPatent.

Application filed June 9, 1913.

Patented June 2, 1914.

Serial No. 772,561.

which the cooling water is to be admitted: 8, an axial bore extendinginwardly from one end of the impeller shaft: 9, a boss secured to theouter end of the shaft and havmg a circular exterior concentric with theshaft and provided with an axial bore: 10, a pipe having its inner endtightly fitted, as by screwing, to the inner end of the bore 8 of theshaft and having its outer end similarly secured to boss 9, the aXialbore of the boss forming an outward continuation of the bore of thepipe: 11, a passageway extending radially from the inner end of theaxial bore of the pipe through the shaft and through the hub of theimpeller and into a chamber in one of the lobes of the impeller 12, awater-supply pipe to deliver water through the bore of boss 9 and pipe10: 13, a swivel connection, provided with a stuilingbox, connectingpipe 12 with boss 9 so that while the impeller and the shaft and theboss rotate pipe 12 may remain stationary: 14, that portion of the axialbore 8 of the shaft surrounding pipe 10, it being understood that bore 8is larger than the exterior of pipe 10 so as to leave a water passagearound the outside of the pipe: 15, a radial passage leading from theinner portion of bore 8 to the chamber of the lobe of the impelleropposite the lobe into which passage 11 leads: 1G, longitudinal passagesformed in boss 9, their inner ends communicating with bore 8 of theshaft and their outer ends terminating at about the mid-length of boss9: 17, radial passages extending from the outer ends of passages 16 andpreferably through a collar formed on the boss: 18, a stationary casingsurrounding the boss and the collar, this casing being diametricallydivided so as to permit of its being put upon the boss, it beingunderstood that this casing need not fit or touch the boss at any point:19, a water-discharge pipe leading down from the casing: 20, lugsprovided upon the wall of the casing to serve, if desired, in securingthe casing against a fixed support, the casing of the blower forinstance: and 21, annular projections inwardly from the side walls ofcasing 18, concentric with the aXis of the impeller, these projectionsfreely straddling the collar of the boss containing the passages 17.

The cooling water entering inlet-pipe 12, prefe'ably being pumpedthereinto, passes through the swivel connection and the axial bore ofthe boss and through pipe 10 and then through passage 11 into one of thecompartments of lobe 2 of the impeller. From there the water goes intothe other compartment of lobe 2, and thence through apertures 7 andrecess 6 to a compartment of lobe 3, and thence to the other compartmentof that lobe, and thence through passage 15 to the outer portion 1a ofthe axial bore of the shaft, and thence through passages 16 and 17 fromwhich latter passages the water is thrown by centrifugal force into thecasing, from which it departs by outlet pipe 19. The circulating watercarries away heat from the impeller, and it is manifest that no closefitting of the casing with the boss is required to take care of thedischarge water, no water-tight fits being required between casinglS andthe boss, the conditions of construction being such that it is desirablethat a'very liberal degree of looseness be provided between the boss andthe contiguous portions of the casing.

7 e claim 1. A rotary blower comprising an impeller having chamberedlobes whose chambers communicate with each other, a shaft having theimpeller secured upon it and having an axial bore communicating with oneof the lobe-chambers through the medium of a transverse passage, a bossconcentrically mounted on the outer end of the shaft and having apassage placing the periphery of the boss in communication with theouter portion of said axial bore, a casing loosely surrounding the bossand adapted to receive water discharged from the periphery of the boss,a discharge-pipe connected with the casing to carry away the waterreceived from the boss, a pipe having its inner end secured at the innerend of said axial bore, a transverse passage placing the inner end ofsaid pipe in communication with a lobechamber other than the one withwhich said axial bore is in communication, said boss having an axialpassage forming an outward prolongation of said pipe, a stationary inletpipe, and a swivel connection between said inlet-pipe and the axial boreof the boss, combined substantially as set forth.

2. A rotary blower comprising, an impeller having chambered lobes whosechambers communicate with each other, a shaft having the impellersecured upon it and having an axial bore communicating with one of thelobecham'bers' through the medium of a transverse passage, a collaredboss concentrically mounted on the outer end of the shaft and having apassage placing the periphery of the collar of the boss in communicationwith the outer portion of said axial bore, a casing loosely surroundingthe boss and adapted to receive water discharged from the periphery ofthe collar of the boss, a discharge-pipe connected with the casing ,e io

to carry away the water received from the collar of the boss, a pipehaving its inner end secured at the inner end of said axial bore, atransverse passage placing the inner end of said pipe in communicationwith a lobe-chamber other than the one with which said axial bore is incommunication, said boss having an axial passage forming an outwardprolongation of said pipe, a stationary inlet pipe, and a swivelconnection between said inlet-pipe and the axial bore of the boss,combined substantially as set forth.

3. A rotary blower comprising, an impeller having chambered lobes whosechambers communicate with each other, a shaft having the impellersecured upon it and having an axial bore communicating with one of thelobe-chambers through the medium of a transverse passage, a collaredboss concentrically mounted on the outer end of the shaft and having apassage placing the periphery of the collar of the boss in communicationwith the outer portion of said axial bore, a casing loosely surroundingthe boss and adapted to receive water discharged from the periphery ofthe collar of the boss, annular projections inwardly from the sidewallsof the casing to near the collar of the boss, a discharge-pipe connectedwith the casing to carry away the water received from'the boss, a pipehaving its inner end secured at the inner end of said axial bore, atransverse passage placing the inner end of said pipe in communicationwith a lobechamber other than the one with which said axial bore is incommunication, said boss having an axial passage forming an outwardprolongation of said pipe, a stationary inlet pipe, and a swivelconnection between said inlet-pipe and the axial bore of the boss,combined substantially as set forth.

4. A rotary blower comprising, an impeller having chambered lobes whosechambers communicate with each other, a shaft having the impellersecured upon it and having an axial bore communicating with one of thelobe chambers through the medium of a transverse passage and carrying apassage extending outwardly from said axial bore at a point endwiseoutside the impeller, a casing loosely surrounding the shaft at saidlast-mentioned passage and adapted to re ceive water dischargedtherefrom, a disohargepipe connected with said casing to carry away thewater received thereby, a supply-pipe disposed within the axial bore ofthe shaft and having its inner end in communication with a lobe-chamberother than the one with which said axial bore is in communication, and astationary inletpipe having swiveled connection with said supply-pipe,combined substantially as set forth.

5. A rotary blower comprising, an impeller having chambered lobes whosechamhers communicate with each other, a shaft having the impellersecured upon it and having an axial bore communicating with one of thelobe chambers through the medium of a transverse passage and carrying acollar provided with a passage extending outwardly from said axial boreat a point endwise outside the impeller a casing loosely surrounding theshaft at said last-mentioned passage and adapted to receive waterdischarged therefrom, annular projections inwardly from the side wallsof the casing to near said collar, a discharge-pipe connected with saidcasing to carry away the water received thereby, a supply pipe disposedwithin the axial bore of the shaft and having its inner end incommunication with a lobe-chamber other than the one with which saidaxial bore is in communication, and a stationary inlet-pipe havingswiveled connection with said supply-pipe, combined substantially as setforth.

GEORGE O. HICKS, JR. RALPH G. ENYART.

\Vitnesses:

RALPH R. LENING, GLEN R. HELLER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

